package com.dp.interceptor;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.dp.dto.UserDTO;
import com.dp.utils.UserHolder;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.dp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.dp.utils.RedisConstants.LOGIN_USER_TTL;

/**
 * @author KT917
 * @date 2022/11/17
 */
public class RefreshTokenInterceptor implements HandlerInterceptor {

    // TODO 技巧1：我们无法从不是组件的 地方使用Spring注入的注解因此可以使用构造函数注入
    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取session
        //2. HttpSession session = request.getSession();
        // TODO  1.获取请求头中的token
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)) {
         return true;
        }
        //2. 获取session中的用户
        //        Object user = session.getAttribute("user");
        String tokenKey = LOGIN_USER_KEY + token;
        // TODO 2. 基于token 获取redis 中的用户
        Map<Object, Object> userMap =
                stringRedisTemplate.opsForHash().entries(tokenKey);

        //3. 判断用户是否存在
        if (userMap.isEmpty()) {
          return true;
        }
        // TODO 将查询到的Hash 数据转为DTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        //5.存在 保存用户信息到ThreadLocal

        UserHolder.saveUser(userDTO);
        // TODO 刷新token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL, TimeUnit.MINUTES);
        //6. 放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
    }
}
